Abstract
High energy cosmic ray electrons and positrons probe the local properties of our galaxy. In fact, regardless of the production mechanism, electromagnetic energy losses limit the typical propagation scale of GeV-TeV electrons and positrons to a few kpc. In the diffusion model, the presence of nearby and dominant sources may produce an observable dipole anisotropy in the cosmic ray fluxes. We present a detailed study on the role of anisotropies from nearby sources in the interpretation of present cosmic ray electron and positrons fluxes. Predictions for the dipole anisotropy from known astrophysical sources as Supernova Remnants (SNRs) and pulsars taken from the Green and the Australia Telescope National Facility (ATNF) catalogs are shown. The results are obtained from models compatible with the most recent AMS-02 data on electrons and positrons fluxes. In particular, anisotropies for single sources as well as for a distribution of catalog sources are discussed. We compare our results with current anisotropy upper limits from the Fermi-LAT and PAMELA experiments, showing that the search of anisotropy in the electron and positron fluxes represents a complementary tool to inspect the properties of close SNRs, as for example the Vela SNR.
Highlights
In the last years, high precision measurements of the fluxes of electrons and positrons (e±) in Cosmic Rays (CRs) have been performed by the AMS-02 [1, 2], Fermi -LAT [3] and PAMELA [4] experiments
The observed fluxes can be interpreted as the emission from a variety of astrophysical sources in the Galaxy
The production of CR e± in our galaxy is possible through different processes
Summary
High precision measurements of the fluxes of electrons and positrons (e±) in Cosmic Rays (CRs) have been performed by the AMS-02 [1, 2], Fermi -LAT [3] and PAMELA [4] experiments. Searches for anisotropies in the electron plus positron (e− + e+) flux [5], the positron to electron ratio [1] and the positron (e+) flux [6] have been presented respectively from the Fermi -LAT, AMS-02 and PAMELA experiments, all ending up with upper limits on the dipole anisotropy. In this work we discuss how the search for anisotropies in the e± fluxes at GeV-TeV energies can be an interesting tool, in addition to the measured fluxes, to study the properties of near sources, as for example near SNRs
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